Wow, 15 levels is a lot! Do you mean full days and nights? Or separately? I aimed at around 8 days. Did you play on normal?
I hope it was still fun! :)
Yep 15 full days and nights on normal. I kinda just skimmed the instructions initially so the first 3ish days were mostly building fire instead of distributing them more equally so that definitely slowed me down and I think I just got unlucky a few times when I built out the other elements. Re-reading my post, I must have been too wrapped up thinking about the design but yes, the first 10 days were definitely fun so I think your target of 8 was perfect (and it wasn't that it was un-fun after that, just definitely increasingly tedious, esp as I started to wonder if there was bug).
Having some more time to think, what I really like is how it's kind of a series of micro puzzles. Balancing complexity is always hard but I think this was a super cool way to address it. Generally there was clear winner for large traversal but then actually taking out enemies was only thinking a few moves ahead, instead of dozens. Another addendum, while it would have been nice to pan around, having the minimap was great, it really gave a sense of strategy.